Isolation question

[Plain Ian]

Units with their backs to a river are very vulnerable and likely to suffer additional losses caused when they're Disrupted/Broken and there's no valid retreat path. Obviously, stacks of A quality units are still very difficult to deal with even in that situation as they can't Disrupt unless their morale drops to B in some way.

Isolation will make the A quality unit automatically drop to B. One of the things I don't like about PzC sometimes is the cumulative effect of modifiers. If a unit starts off at moderate to low quality a few bad things happening to it (isolation/low ammo/disruption) and its junk.....

Interesting situation though. Bridge was blown with a rearguard left on the other side? I guess the aim was to prevent the Germans closing up to the Engineers and Disrupting them before they could blow the bridge. 

I thought the problem was caused by using non locking ZOC rules and changing the parameters to allow units to move through ZOC. However I've realised that whilst units can move easier through enemy ZOC, supply tracing is still blocked by ZOC. So the units would still be Isolated.